Losing Data Acquistion with Empower and Shimadzu GC

We have a Shimadzu GC-2100 plus connected to a Waters LAC/E auquistion server, connected to an Enterprise Empower III application via Citrix. We have sporadically lost connection to the instrument and data auquistion stops, sometime 3/4 through a 24 hour test run. No indication of what the problem is, everything is on UPS power, good network connectivity. The configuration is such that the local acquistion server should continue to cache data if it loses server/network connectivity. It doesn't, it almosts looks like we lose connectivity with the instrument. Which appears fine. Anybody else have any insight on this? Just curious if Citrix could play a part. Thanks in advance.